Surveyor&#39;s leveling-rod.



W. J. BRNECUT.

SURVEYOR'S LEVELING ROD.

APPLICATION FILED MARI 4. |916.

1,290,295. Y PAIenIed 0IA. 3,1916.

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A TTHNEYS f ao WILLIAM JOHN BARNECUT, OFY EAINESDALE, MICHIGAN.

SUBVEYORS LEVELING-ROD.

Specification or" Letters Patent.

Patented (1ct. 3, 1916.

Application lc. March 4, 1916. Serial No. 82,134.

T0 all whom t may concern:

Be it known that I, WILLIAM J. BARNE- cU'r, a citizen of the United States, and a resident of Painesdale, in the county of Houghton and State of Michigan, have invented new and useful Improvements in Surveyors Leveling-Rods, of which the following is a full, clear, and exact description.

The invention relates to surveyors implements, and its object is to provide certain new andvuseful improvements in leveling rods whereby the user can readily read the correst elevation without further` computation.

In order to provide the desired result, use is made of a computing device mounted on the target adapted to be moved up and down on the rod, the computing device being controlled by the movement of the target on the rod.

A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a front elevation of the leveling rod with part of the target broken out; Fig. 2 is a transverse section of the same on the line 2-2 of Fig. 1, and Fig. 3 is a sectional plan view of the same.

The rod 10 is provided on its front with the usual linear graduation 11 and on the said rod is mounted to slide up and down a sleeve 12 attached to the back of a casing 13 supporting at its front a target 14. A set screw 15 screws on the sleeve 12 and bears against one side of the rod 10 to fasten the target in place on the rod 10. A computing device is mounted in the casing 13,.and is controlled by the up and down movement of the target on the rod 10. The computing device is provided with a series of number Wheels 20, 21, 22, 23 and 24 provided' on their peripheral faces with digits from O to 9, the digits of the several number wheels 20, 21, 22, 23 and 24 being adapted to form rows of which the front row is visible through a reading opening 25 formedin the face of the target 14. The number wheels 20 and 21 are the unit and tens number wheels for indicating the decimals of feet or similar linear measurement, and the number wheels 22, 23 and 24 are the unit, tens and hundreds number wheels the units, tens `and hundreds feet of an 6.16-

Aback of the casing for indicatingk vation. The number wheels 20, 21, 22, 23 and 24 are mounted to turn loosely on a shaft 26 and are turned in either direction and one from the other by suitable devices such as are found in devices of this kind so that further detail description of the same is not deemed necessary. l

The unit number wheel 20 of the decimals 1s provided with a hub 30 extending through one side of the casing 13 and-provided at its outer end with a handle 31 for shifting the unit wheel 20 lengthwise on the shaft 26. On the hub 30l is fastened a pinion 32 normally in mesh with a gear wheel 33 secured on a shaft 34 journaled in the rear of the casing 13. The gear wheel 33 extends at its back through an opening 35 in the 13 and the said gear wheel isy in mesh with a rack 36 attached to the face of the rod 10 and extending throughout the length thereof.

It will be noticed that when the target is moved up or down on the rod 10, the gear wheel 33 is turned and consequently the pinion 32 and the unit number wheel 20, which in turn causes the tens number wheel 21 to turn on the completion of a revolution. In a like manner, the unit, tens and hundred number wheels 22, 23 and 24 are turned one from the preceding one, asis well known in the art.

The up and down movement of the target 14 on the rod 10 may be facilitated by the operator lturning a crank 37 on one outer end of the shaft 34. A spring 40 held inside of the casing 13 bears against the hub 30 to hold the latter against accidental shifting on the shaft 26.

When it is desired to render the computing device inactive, the operator pulls the handle 31 outward and with it the sleeve 30 to move the pinion 32 out of mesh with the gear wheel 33. Y'Vhen the target is now moved up or down on the rod 10 then the computing device is not actuated. Normally the pinion 32 is in mesh with the gear.

wheel 33, and when the target 14 is moved up or down on the rod 10 then the gear wheel 33fis rotated on account of being in mesh with the rack 36 so that the number wheels 20, 21, 22, 23 and 24 are turned correspondingly to indicate a desired elevation without further computation, as hereinafter more fully explained.

In using the leveling rod, the vrod 10 is SQ@ 011 a bench niark of known elevation, say

454.83 feet, and

the number wheels 20, 21, 22, 23 and 24 are turned correspondingly until the amount 454.83 appears in theI reading openings 25, it being understood that during the turning of the number wheels by the operator, the pinion 32 is held out of mesh with the gear wheel 33, as above explained. The target is moved to zero position on the rod l0, after which the pinion 32 is moved aga-in into mesh with the gear wheel 33 in mesh with the rack 28. The target 14 is vnow moved up on the rod l0 to the height of the surveyor-s instrument, and which height is say 2.06 feet above the bench mark, so that tl e number wheels 20, 21,22, 23 and 24 display 456.89, as shown in Fig. l. Now if the rod l0l is placed on another point of a dierent elevation than the bench mark and the target moved tothe same height as the leveling instrument then the Wheels 20, 2l, 22, 23 and 24 are turned proportionately to read the correct elevation of that point without further computation. It is understood that the gearing connecting the rack 36 with the number wheel 20 is so proportioned that the number wheels are turned to display a linear measurement corresponding to the distance the target is moved up or down on the rod l0.

Having thus described my invention, I claim` as new and desire to secure by Letters Patent: y Y

l. A surveyors leveling rod, comprising ay rod, a target movable up and down on the rod, computing device mounted on the target and having a member controlled by the movement of the target on the rod to actuate the computing deviceto indicate the elevation, and means whereby the said member of the computing device may be moved out of active position.

2. A surveyors leveling rod, comprising a rod provided with a rack extending lengthwise of the rod, a target slidable up and down on the said rod, a computing device having number wheels, a gear wheel in mesh with the said rack, one of said numpis of ber wheels beingmounted te slide and provided with a pinion adapted to be moved into mesh with said gear wheel to actuate the said computing device on sliding the target up or down on the rod.

A surveyors leveling rod, comprising a` r'od provided -with a rack extending lengthwise of the rod, a target slidable up and down on the said rod and provided with reading openings, and a computing device arranged on theback of the target and having a yseries of number wheels, a shaft on which the,y number wheels are mounted to turn, the first number twheel being mounted to slide on the said shaft, a pinion on the said first number wheel, and a gear wheel in mesh with the said pinion and the said rack.

4. A surveyors leveling rod, comprising a rod provided with a rack extending lengthwise of the rod, a casing, a sleeve attached to the back of the casing and mounted to slide up and down on the rod, a target supported at the front of the casing and provided with readingA openings, a computing device having a series of number` wheels, a shaft journaled in the casing and on which the said number wheels are mounted to turn, the 'first' number fwheel being mounted to slide on Said shaft and having a hub extending through one side of the casingand provided itsv outer end with a handle, a pinion on the said hub, a shaft journaled in the rear of th casing, a gear wheel on said shaft in mesh with the said rack and normally in mesh with the said pinion, ,and a spring bearing against the said hub to Hold the latter against accidental shifting.

ln testimony whereof have signed my name to this specification in the presentje of two subscribing witnesses.

WILLIAM .IoIIN Bri-armour. Witnessesi p J. BENNETTS, WILLIAM N. Ro'wsn.

this patent may be obtained for ive cents each, by addressing` th "imis'siii'c' of Patents,

Washington, 

